Daylilies have been shown to be able to pull themselves deeper into the soil and to reposition themselves more shallowly when too deep.
I just read one example that stated when the plant was dug up it was found to have two crowns(one stacked on top of the other), and that all the energy went into creating the second crown so it did not bloom. The reason for the second crown was said to be because the plant was too deep, and the plant was too deep because of repeated applications of mulch too close to the plant.
In a post I showed a photo of basically the same thing. However, the "two" crowns, one above the other were unrelated to the daylily being too deep in the soil and lack of blooming. The crown closer to the soil surface was the new crown created in the current growing season while the buried crown was the older crown from the previous growing season(s). Is it possible that the example is also actually of a newer (higher) crown versus an older (deeper) crown rather than of a crown becoming too deep?
The thread is
The thread "Crown Planting Depth - Especially in Areas with Very Hot Summers" in
Daylilies forum
My post with the figure is
http://garden.org/thread/view_...
